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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        const arr = [10, 20, 30]
        // const nerArr = arr.filter(function(item, index){
        //     // console.log(item)
        //     // console.log(index)
        //     return item >= 20
        // })


        const nerArr = arr.filter(item => item >= 20)
        console.log(nerArr);
    </script>
</body>
</html>